I think the only thing you REALLY need to obscure, to make the game work, is eye contact. So, don't worry if there's nothing good around to hide behind; I'm sure there's something around that you can Peekaboo with.

P.S. I was just searching Amazon for the term "Peekaboo", looking for an image to associate with this post. There's a shocking dichotomy behind the results. Go take a look and see what you find.